Matching Items (2)
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- All Subjects: High temperatures
- Creators: Britton, Britnie
Description
High temperature CO2 perm-selective membranes offer potential for uses in various processes for CO2 separation. Recently, efforts are reported on fabrication of dense ceramic-carbonate dual-phase membranes. The membranes provide selective permeation to CO2 and exhibit high permeation flux at high temperature. Research on transport mechanism demonstrates that gas transport for ceramic-carbonate dual-phase membrane is rate limited by ion transport in ceramic support. Reducing membrane thickness proves effective to improve permeation flux. This dissertation reports strategy to prepare thin ceramic-carbonate dual-phase membranes to increase CO2 permeance. The work also presents characteristics and gas permeation properties of the membranes. Thin ceramic-carbonate dual-phase membrane was constructed with an asymmetric porous support consisting of a thin small-pore ionic conducting ceramic top-layer and a large pore base support. The base support must be carbonate non-wettable to ensure formation of supported dense, thin membrane. Macroporous yttria-stabilized zirconia (YSZ) layer was prepared on large pore Bi1.5Y0.3Sm0.2O3-δ (BYS) base support using suspension coating method. Thin YSZ-carbonate dual-phase membrane (d-YSZ/BYS) was prepared via direct infiltrating Li/Na/K carbonate mixtures into top YSZ layers. The thin membrane of 10 μm thick offered a CO2 flux 5-10 times higher than the thick dual-phase membranes. Ce0.8Sm0.2O1.9 (SDC) exhibited highest CO2 flux and long-term stability and was chosen as ceramic support for membrane performance improvement. Porous SDC layers were co-pressed on base supports using SDC and BYS powder mixtures which provided better sintering comparability and carbonate non-wettability. Thin SDC-carbonate dual-phase membrane (d-SDC/SDC60BYS40) of 150 μm thick was synthesized on SDC60BYS40. CO2 permeation flux for d-SDC/SDC60BYS40 exhibited increasing dependence on temperature and partial pressure gradient. The flux was higher than other SDC-based dual-phase membranes. Reducing membrane thickness proves effective to increase CO2 permeation flux for the dual-phase membrane.
ContributorsLu, Bo (Author) / Lin, Yuesheng (Thesis advisor) / Crozier, Peter (Committee member) / Herrmann, Macus (Committee member) / Forzani, Erica (Committee member) / Lind, Mary Laura (Committee member) / Arizona State University (Publisher)
Created2014
Description
This research aims to collect emergency preparedness data around Arizona to zero in on gaps in heat adoption decision-making and promote structural governance to enforce synchronized deployment of services specifically for residents living in mobile and manufactured housing communities (MMHC). Mobile homes in Maricopa County comprise 5.2% of the total housing stock; 686 mobile home parks throughout the Phoenix Metropolitan Area. A cluster located in the Mesa area totals 92,031 mobile homes in Maricopa County (Heat et al. for Mobile Homes, 2021). This document supplies a package of heat-resilient solutions to MMHC, owners, landlords, and residents for a power outage during and after the event. Findings include recommendations for a collective effort in structuring a Heat Action Plan amongst city departments, utility companies, mobile home residents, AAMHO board members, and any other local ambassadors to prevent deaths in the event of a power outage, specifically during extreme temperature months (May-August). We intend to start mobilizing action to prepare and pivot toward responses to prevent heat-related deaths followed by power outages during the summer. Highlighting the gash in communication between park managers, owners, and landlords with the utility companies is crucial. Consequently, the selected platform for exchanging knowledge with the residents promptly must be addressed beforehand.
ContributorsBritton, Britnie (Author) / Varfalameyeva, Kate (Author) / Noble, Kathleen (Author) / Solís, Patricia (Author)
Created2024-01-01